Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Line Items]
Federal Home Loan Bank Stock, redemption period, years after membership termination	5 years
Number of days overdue to be classified as nonaccrual	90 days
Troubled debt restructured loans, management determination of loans on nonaccrual status to return to accrual status, period	6 months
Time loan is reported as TDR from date of restructuring	1 year
Equity Method Investment, Number of Investments	2
Number of low-income housing complexes included in equity method investments	2
Equity Method Investee, One [Member]
Accounting Policies [Line Items]
Equity method investment, ownership percentage	99.90%
Equity Method Investee, Two [Member]
Accounting Policies [Line Items]
Equity method investment, ownership percentage	99.90%
Premises and Improvements [Member] | Minimum [Member]
Accounting Policies [Line Items]
Estimated useful life (in years)	5 years
Premises and Improvements [Member] | Maximum [Member]
Accounting Policies [Line Items]
Estimated useful life (in years)	40 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Accounting Policies [Line Items]
Estimated useful life (in years)	3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Accounting Policies [Line Items]
Estimated useful life (in years)	20 years